For a very modern country, wifi sure comes sparingly in cafes and hotels around Japan. During my first trip to Japan in 2013, I got lost and couldn't find my bearing without wifi. So knowing how hectic our schedule was going to be, I opted to rent a portal wifi router from Japan Wireless.
Honestly it was all Cousin's hardwork because he did all the research being the tech geek that he is and so I left him in charge of it. And he suggested the Mobile Wifi Router LTE (75Mbps). For a 9 day rental, it was 5,650yen (RM170). That came up to about RM18 a day.
The order was made online through the Japan Wireless website and paid through Paypal. A 500yen shipping fees was added on top of the total price as the company would ship it to our first accommodation in Japan upon arrival which for us was Yume Nomad in Kobe.